One of my clients has a server that freezes every hour at the same time. I believe that when you reboot, whatever time the server comes up is the "magic time" wherein it then begins to lock up each hour. For example- if the server completes its boot at 0938, it will then lock up at 1038, 1138, 1238 and so on. All programs running from it lock up or disconnect entirely. if working directly on the server the mouse moves, but no response from any click or key press. The server is the only one on site- there are only four users. Naturally it is the DC/DNS/DHCP. It also hosts TrendMicro AV. It used to host Spiceworks, but that has been removed. There is absolutely nothing of any help in the Event Logs. I've ran chkdsk and sfc (both of which found and repaired errors) but no change. I assume it has to be a service or app, but I have no idea how to track it.